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考虑地下水和坡积体-稳定坡体接触面附近土体的应变软化,在Bingham模型的基础上研究滑动接触面对坡积体渐进变形及滑坡启动运动规律的影响,得到了坡积体渐进变形和滑坡启动的解析解。结果表明:坡积体存在着随深度呈幂函数形式分布的变形场或速度场,且在接触面附近剪切速率最大;当接触面附近土体渐进变形达到阈值时,应变软化导致力学参数降低,发生渐进破坏,坡积体由渐进变形过渡到滑坡启动阶段。将模型计算值与某滑坡实测位移值比较,得到较好的模拟结果。
Based on the Bingham model, the influence of the sliding contact surface on the gradual deformation of the slope body and the start-up movement of the landslide is studied considering the strain softening of the soil near the contact surface between the groundwater and the slope body - stabilized slope. The gradual deformation of the slope body is obtained And analytical solutions for landslide startup. The results show that there exists a deformation field or a velocity field distributed along the depth as a power function, and the shear rate is the maximum near the contact surface. When the soil near the contact surface gradually reaches the threshold value, the strain softening results in a decrease of the mechanical parameters , Progressive destruction occurs, and the slop body transitions from progressive deformation to the start of landslide. Comparing the calculated value of the model with the measured displacement value of a landslide, the better simulation result is obtained.